Metoprolol (Toprol Xl) is a beta blocker.

Take Metoprolol (Toprol Xl) exactly as directed.

Check with your doctor if any of these most common side effects persist or become bothersome:

Blurred vision; confusion; constipation; depression; diarrhea; dizziness; drowsiness; dry mouth/eyes; headache; lightheadedness; nausea; nightmares; sleeplessness; stomach pain/upset; tiredness; weakness.

Seek medical attention right away if any of these severe side effects occur:
Severe allergic reactions (rash; hives; itching; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue); chest pain; fainting; pounding in the chest; shortness of breath; slow heartbeat; sudden unusual weight gain; swelling of arms, hands, or feet; wheezing; yellowing of skin or eyes.

This is not a complete list of all side effects that may occur. If you have questions or need medical advice about side effects, contact your doctor or health care provider.

Tell your health care provider if you are taking any of the following medicines.

Barbiturates (eg, phenobarbital), indomethacin, or phenylpropanolamine because they may decrease Metoprolol (Toprol Xl)'s effectiveness
Amiodarone, cimetidine, digoxin, disopyramide, flecainide, hydralazine, ketanserin, lithium, mefloquine, oral contraceptives (birth control pills), quinazolines (eg, imatinib), quinidine, thioamines (eg, propylthiouracil), or verapamil because serious side effects, such as very slow heart rate and very low blood pressure, may occur
Bupivacaine, disopyramide, flecainide, hydralazine, ketanserin, or lidocaine because the risk of their side effects may be increased by Metoprolol (Toprol Xl)
Clonidine because stopping either of these medicines suddenly can lead to a rapid increase in high blood pressure

This may not be a complete list of all interactions that may occur. Ask your health care provider if Metoprolol (Toprol Xl) may interact with other medicines that you take.

If overdose is suspected, contact your local poison control center or emergency room immediately.

Tell your doctor or pharmacist if you have any medical conditions, especially if any of the following apply to you:

if you are pregnant, planning to become pregnant, or are breast-feeding

if you are taking any prescription or nonprescription medicine, herbal preparation, or dietary supplement

if you have allergies to medicines, food, or other substances

if you have tumors on your adrenal gland, have an overactive thyroid, or are scheduled to have surgery

if you have or have a history of liver, heart, or blood circulation problems

if you have diabetes mellitus, chronic obstructive pulmonary disease, bronchitis, bronchospastic disease, or a history of asthma

if you have recently had a heart attack

Do not take 2 doses at once to make up for a missed dose.

Treating high blood pressure, alone or with other medicines; long-term treatment of chest pain; and reducing the risk of death because of heart problems in patients who have had a heart attack.

Metoprolol (Toprol Xl) may also be used to treat other conditions as determined by your doctor.

Store at room temperature away from heat, light and moisture.

If your doctor has instructed you to check your blood pressure and heart rate regularly, be sure to do so.

Do not take any medicines used to treat colds or congestion without first consulting with your doctor or pharmacist.

Diabetes patients - Metoprolol (Toprol Xl) may affect your blood sugar. Check blood sugar levels closely. Ask your doctor before you change the dose of your diabetes medicine.

Tell your doctor or dentist that you take Metoprolol (Toprol Xl) before you receive any medical or dental care, emergency care, or surgery.

If you have any questions about Metoprolol (Toprol Xl), please talk with your doctor, pharmacist, or other health care provider.